In heraldic achievements, the helmet or helm is situated above the shield and bears the torse and crest. The style of helmet displayed varies according to rank and social status, and these styles developed over time, in step with the development of actual military helmets. In some traditions, especially German and Nordic heraldry, two or three helmets (and sometimes more) may be used in a single achievement of arms, each representing a fief to which the bearer has a right. For this reason, the helmets and crests in German and Nordic arms are considered to be essential to the coat of arms and are never separated from it.
Open-visored or barred helmets are typically reserved to the highest ranks of nobility, while lesser nobility and burghers typically assume closed helms. While these classifications remained relatively constant, the specific forms of all these helmets varied and evolved over time. The evolution of these heraldic helmets followed the evolution of combat techniques and tourneying in the Middle Ages. The practice of indicating rank through the display of barred or open-face helmets did not appear until around 1615, however, long after the practice of heraldry had been established. As jousting with lances was supplanted by tourneying with maces, the object being to knock the opponent's crest off his helmet, the fully enclosed helmet gave way to helmets with enlarged visual openings with only a few bars to protect the face. These barred helmets were restricted by the imperial chancellery in Vienna to the nobility and certain doctors of law or theology, while the jousting helm was freely adopted by anyone. The direction a helmet faces and the number of bars on the grille have been ascribed special significance in later manuals, but this is not a period practice. A king's helmet, a golden helmet shown affronté with the visor raised, crowned with a royal crown, became adopted by the kings of Prussia. In ecclesiastical heraldry, bishops and other clergy use a mitre or other rank-appropriate ecclesiastical hat in place of a helmet.
Historically, however, the helmet was not specifically granted in an achievement of arms, but was naturally assumed by appropriate rank as a matter of "inherent right", so a helmet with torse and mantling would not be misplaced even above a shield which had no crest to place above it. When multiple crests need to be depicted, the time honoured practice in English heraldry is to draw the crests above a single helmet, each being separated from it, while in German heraldry, where multiple crests appear frequently after the 16th century, each crest is always treated as inseparable from its own helmet and turned in agreement with the helmet. In continental Europe, multiple helmets were usually turned inward, with the center helm (if an odd number) turned affrontê, while in Scandinavian heraldry the helmets were usually turned outward. The arms of the last margraves of Brandenburg-Ansbach consist of a shield with 21 quarterings topped with a record thirteen helmets and crests.
Open or barred helmet, reserved for members of the nobility
The usage of heraldic helmets in Britain is as follows: gold helmet with bars for the royal family; silver helmet with gold bars for peers; steel helmet with gold bars for the non-peerage Scottish feudal baron; open steel helmet shown affronté for knights and baronets; steel tournament helm for Scottish clan chiefs; closed steel helmet for esquires and gentlemen.
The norms of Russian heraldry regarding helmets diverge greatly from the Western European tradition. Alongside the traditional Western open helmet (silver with gold details for titled nobility, steel with gold details for everyone else), as well as the closed helmet sometimes granted by the state, "ethnic" helmets were also in use, not found anywhere else. From the 19th century onwards, ancient Russian families began to use the yerikhonka, the "cap of Jericho", a medieval conical Slavic helmet similar to the Middle Eastern shishak. These followed their own colour system, not corresponding with the use of tinctures for Western helmets: non-titled nobles would use a steel yerikhonka with silver details, barons and counts steel with golden details, knyaz families silver with golden details. The House of Romanov itself used a unique yerikhonka called the "helmet of Alexander Nevsky", based on the royal helmet of Michael I (once mistakenly believed to have belonged to Alexander Nevsky, hence the name). Asian noble families non-Slavic origin who were integrated in the Empire were also allowed an ethnic helmet, usually a misyurka, similar to the yerikhonka in shape but rounder and with an obtuse tip. 
In the modern Russian Federation, the Russian Heraldic Council allows both Western and ethnic helmets (called sheloms in modern Russian heraldic language), but only in their simplest forms, and stripped of any details that may be perceived as symbols of nobility. For Western helmets, this means using commoner kettle hats as opposed to them more aristocratic open and close helmets, while sheloms are to be used without nasal bars, cheekpieces or neck guards, which were sometimes found on older "ethnic" helmets. On the other hand, a commoner helmet may be complemented with a mail coif below. All colours except for steel are forbidden, with the exception of the lining, for which other tinctures may be used (purpure is recommended). However, none of these restrictions apply to direct descendants of old Russian aristocracy, who can use the same helmets as their ancestors alongside the rest of their family arms. 
Both in Imperial and republican Russian heraldry, the direction of the helmet plays no role: whether the helmet is portrayed affronty or turned to the right depends on the shape of the crest.
Open Western helmet: coat of arms of the Pushkin family.
Closed Western helmet: coat of arms of the Skornyakov family.
Aristocratic yerikhonka: lesser coat of arms of the Russian Empire.
Commoner ethnic helmet: coat of arms of Vladimir Kopelev, knight of the For Merit to the Fatherland order.
Commoner Western helmet: coat of arms of Nikolai Likhachev, citizen of Peterhof.
In the same way, clerics of the Anglican Communion entitled to a coat of arms use a similar black hat in place of a helmet.
- Woodcock (1988), p. 202.
- Fox-Davies (1909), p. 303.
- Fox-Davies (1909), p. 319.
- Neubecker (1976), pp. 148, 162.
- Neubecker (1976), p. 148.
- Woodcock (1988), p. 75.
- Fox-Davies (1909), p. 58.
- Fox-Davies (1909), pp. 322-323.
- Fox-Davies (1909), p. 323.
- Neubecker (1976), p. 165.
- Iain Moncrieffe and Don Pottinger (1953). Simple Heraldry Cheerfully Illustrated. Thomas Nelson and Sons. p. 58.
- Структура герба: российская практика. Медведев М.Ю. Геральдика // Специальные исторические дисциплины. СПб, 2003.
- Основные принципы оформления личного герба в современной России. Гражданская геральдика сегодня.
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- Fox-Davies, Arthur Charles; Graham Johnston (1909, 2004). A Complete Guide to Heraldry. Kessinger Publishing. ISBN 1-4179-0630-8
- Neubecker, Ottfried (1976). Heraldry: Sources, Symbols and Meaning. Maidenhead, England: McGraw-Hill. ISBN 0-07-046308-5
- Woodcock, Thomas; John Martin Robinson (1988). The Oxford Guide to Heraldry. New York: Oxford University Press. ISBN 0-19-211658-4